Malicious PDF — malware analysis report

Static analysis result for SHA-256 5525838da3c7576c…

MALICIOUS

PDF

80.1 KB Created: 2021-03-09 10:47:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 808bc44ebb04aef8fe707e3a31552283 SHA-1: e0cfe84ae82528884e2dd1abe33f996e2d572850 SHA-256: 5525838da3c7576c8af143faf7edaf6cdc6e4cac85b6282a00344b3efab89265
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one specifically pointing to 'kuzutuzo.ru', suggesting a phishing or malware distribution lure. The presence of multiple disposable hosting links further supports a malicious campaign aiming to obscure its true origin. No scripts were extracted, but the PDF structure and embedded URIs are sufficient to infer a malicious download or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/123?utm_term=amrita+pritam+novel+pinjar+pdf PDF link annotation
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/ribakagoxoruwo-wamulimarazap-varavak.pdfIn PDF document text
    • http://mokemowowove.mygamesonline.org/zotedusazupozonedo.pdfIn PDF document text
    • http://qlemelest.online/nufepitavudld3k.pdfIn PDF document text
    • https://nepefesin.weebly.com/uploads/1/3/1/4/131410606/b596577f74e.pdfIn PDF document text
    • http://tesopinafap.22web.org/54708878198.pdfIn PDF document text
    • http://bupojew.22web.org/graphing_calculator_software_for_pc_free.pdfIn PDF document text
    • http://praktika-ingenieur.com/wupopewbad8.pdfIn PDF document text
    • https://dosolixegu.weebly.com/uploads/1/3/4/3/134340741/medapew.pdfIn PDF document text
    • http://dizurexemubegog.mygamesonline.org/55160512406.pdfIn PDF document text
    • http://helper-badges.com/apogee_symphony_mk1_manualocp0u.pdfIn PDF document text
    • http://bcipreactivaperu.com/mixubejitopibukexejsq85x.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/can_you_day_trade_stocks_on_robinhood.pdfIn PDF document text
    • http://vapawuruvoxo.22web.org/torolupaxotutivov.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/cub_scouts_uniform_cost.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://kiwejip.epizy.com/kizubiligivij.pdfIn PDF document text
    • http://vanowawupusizi.rf.gd/nemizobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87687d31-0775-45fe-9505-0fef461d2683/proscan_plded3273a-b_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2410ba1c-f5e5-479a-b815-b02f84ae1936/2994981047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12bbd877-a2c3-4333-aa01-df7d26e0429e/wodotun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ddfd186-3670-41ad-b19d-e3a02f78bdd0/math_destroyer_review.pdfIn PDF document text
    • http://toxawilel.epizy.com/renawidinevunifuwapunug.pdfIn PDF document text
    • http://fobapisarut.epizy.com/google_android_os_architecture.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 5132 bytes
SHA-256: 7e7262edf44713d0a819f783f74b15097aff9754c4c71e9360ffedc55e5afacf
font_01_sfnt_off00010376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10376 2516 bytes
SHA-256: bf5fa79da7a4feab92cae1da63a712f06f4f80a18c697efb2ee0c332fb546cf2
font_02_sfnt_off00010e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4D 10604 bytes
SHA-256: 1a97b1b373f02d02d36e6b59a7036804a467994201ccf04e3ab1d2f3fe7d24fc

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